Is the armor allowed to attack the opposing armor, or just the Ogre? And can the Ogres go after each other in the non-CP scenario? I know it might be a bad idea since it would necessarily slow you down to cross the board rather than forging straight ahead, but depending on how things play out it might be worthwhile...

I would tend to assume, in the absence of verbiage to the contrary, that anything not expressly forbidden is allowed.

The choice between attacking the opposing armor and staying in place to waylay the Ogre coming at you sounds actually pretty interesting. As it says, "Lots and lots of units are going to get blown up here very quickly."

I was thinking that variant scenarios using other Ogres would be fun. Why should the Mk Vs have all the fun?

I suppose part of the reason we don't see more Paneuro Ogre variants in scenarios is that other than the Fencer ODE/6e doesn't include them in chipboard. That and several of them are mechanically equivalent to their Combine Counterparts.